3-Nonenoic acid is primarily used in the flavor and fragrance industry due to its characteristic green, fatty, and slightly waxy odor. It is often incorporated into formulations to impart a fresh, natural scent, making it suitable for perfumes, cosmetics, and personal care products. Additionally, it serves as an intermediate in organic synthesis, particularly in the production of more complex chemical compounds. Its unique properties also make it valuable in research and development for creating new flavors or fragrances that mimic natural aromas.